JP2009216026A - Vertically-mounted hermetic compressor and air conditioner - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a vertically-mounted hermetic compressor in which a temperature sensor can be easily installed and which controls an electronic expansion valve by detecting temperatures of a lubricant oil and a discharge pipe, well retains the lubricant oil in the compressor, and has high reliability, so as to solve the problems in a conventional compressor such as a high cost of a dilution ratio sensor having a low versatility, a low productivity in assembly, and a difficulty in installing a temperature sensor because a main body of the compressor is a cylindrical vessel, and to provide an air conditioner. <P>SOLUTION: In the vertically-mounted hermetic compressor, a pipe-formed copper tube 26 is disposed on a sidewall of a lower part of a compressor 1 in which a compressor lower part-situated temperature detection sensor is installed. If a difference between a temperature detected by a discharge temperature detection sensor for detecting a discharge temperature and a temperature detected by the compressor lower part-situated temperature detection sensor for detecting the temperature of lubricant oil 24 exceeds a prescribed value, an electronic expansion valve reduces a flow rate, and a dilution ratio of the lubricant oil in the compressor is maintained low. <P>COPYRIGHT: (C)2009,JPO&INPIT

Description

  The present invention relates to a compressor and an air conditioner that can detect the dilution of lubricating oil collected in the compressor.

  The air conditioner includes a refrigeration cycle in which a compressor, an outdoor heat exchanger, an electronic expansion valve, and an indoor heat exchanger are connected. Lubricating oil is accommodated in the compressor, and is provided to smoothly operate the compression mechanism.

  Generally, the refrigerant discharged from the indoor heat exchanger is somewhat dissolved in the lubricating oil of the compressor when returned to the compressor. The dilution indicating the ratio of the refrigerant dissolved in the lubricating oil is defined as (refrigerant weight dissolved in the lubricating oil) / (refrigerant weight dissolved in the lubricating oil + lubricating oil weight).

When the degree of dilution is higher than a predetermined value, that is, when the refrigerant weight dissolved in the lubricating oil is larger than the predetermined value, the compressor becomes difficult to operate smoothly and may stop. In order to avoid such a situation, for example, as shown in FIG. 8 as an example, a dilution sensor 30 for dilution measurement indicating the ratio of the refrigerant dissolved in the lubricating oil is provided in the compressor, and the dilution sensor is provided with a dilution sensor. When the degree exceeds a predetermined value, the flow rate is reduced by an electronic expansion valve (see, for example, Patent Document 1).
JP-A-5-005562

  However, the above-described configuration has a problem that the cost of a dilution sensor with low versatility is high and productivity in assembly is poor. Moreover, since the compressor main body is a cylindrical container, it was difficult to attach a temperature sensor.

  The present invention solves the above-mentioned conventional problems, and is low in cost and does not require a dilution sensor to be installed in the compressor, so it is excellent in productivity and is attached to the side portion below the compressor in which lubricating oil is stored. By providing the pipe-shaped copper pipe, the temperature sensor can be easily attached, and by detecting the temperature of the lubricating oil and the temperature of the discharge pipe by the copper pipe at the bottom of the compressor, the electronic expansion valve is controlled, It is an object of the present invention to provide a highly reliable vertical hermetic compressor and air conditioner that secures lubricating oil in a compressor.

  In order to solve the conventional problems, the vertical hermetic compressor and the air conditioner of the present invention are provided with a pipe-like copper tube attached to the side surface below the compressor, thereby lubricating the compressor. The temperature of the oil can be measured with a general-purpose pipe-mounted temperature detection sensor, and the same temperature detection sensor can be used for the temperature of the discharge pipe at the outlet of the compressor. The temperature difference between these (temperature difference = discharge pipe temperature) -When the temperature of the copper pipe below the compressor exceeds a predetermined value, the flow rate is reduced by the electronic expansion valve.

  The vertical hermetic compressor and air conditioner according to the present invention prevent the lubricant in the compressor from being in a highly diluted state, and are low cost and excellent in productivity. A harmony machine can be provided.

  1st invention inserts from the hole provided in the lower side of the airtight container of a compressor body, brazes to the airtight container, and also seals the other by brazing and provides the connected pipe-shaped copper pipe Therefore, the temperature of the lubricating oil stored in the sealed container is detected by a pipe-shaped copper tube, and the temperature sensor can be easily attached to the copper tube. The temperature detected by the discharge temperature detection sensor for detecting the temperature of the discharge pipe of the compressor and the temperature detection sensor for the lower part of the compressor for detecting the temperature of the pipe-like copper pipe attached to the side surface below the compressor is When the temperature difference between the discharge temperature and the compressor lower part temperature is lower than a predetermined value, the flow rate is reduced by the electronic expansion valve to reduce the dilution degree inside the compressor. It is possible to prevent the dilution of the lubricating oil in the compressor from increasing.

  In the second invention, a plurality of holes are provided on the lower side surface of the sealed container, and the holes are brazed and connected with a pipe-shaped copper tube. By connecting the holes, the inside of the sealed container is provided. The exact temperature of the lubricating oil being stirred can be measured.

  According to a third aspect of the present invention, a hole or a plurality of holes on the lower side surface of the sealed container is provided with a burring on the outer side of the sealed container. As a result, it is possible to improve the mounting performance, increase the rigidity by increasing the mounting strength of these copper tubes, and suppress the increase in noise and vibration generated from the copper tubes.

  According to a fourth aspect of the present invention, there is provided a vertical hermetic compressor according to any one of the first to third aspects of the present invention in which a copper pipe provided on a lower side surface of a hermetic container for detecting a lubricating oil temperature is installed. It is the air conditioner which comprised the refrigeration cycle. The temperature sensor used to detect the pipe temperature of the heat exchanger can detect the lubricating oil temperature of the compressor, so the parts can be shared, and the temperature of the lubricating oil can be determined by detecting the temperature. And can be controlled by a microcomputer.

  Embodiments of the present invention will be described below with reference to the drawings. In addition, this invention is not limited by embodiment described below.

(Embodiment 1)
FIG. 1 is a sectional view of a vertical hermetic compressor according to an embodiment of the present invention. In FIG. 1, an electric motor 22 and a compression mechanism 23 and a lubricating oil 24 are stored above the sealed container 21 and below the sealed container 21, and inserted from a hole 25 provided on the lower side surface of the sealed container 21. 21 is brazed with a brazing material 27 and the other is brazed with a brazing material 27 to provide a pipe-like copper pipe 26 that is hermetically sealed and connected.

  FIG. 2 is a block diagram according to the embodiment of the present invention. In FIG. 2, the arrow represents the flow of refrigerant such as chlorofluorocarbon during cooling operation. The compressor 1 adiabatically compresses the refrigerant in a low-pressure gas state. A discharge temperature detection sensor 11 that detects the discharge temperature of the compressor 1 is provided at the outlet of the compressor 1, and a compressor lower portion temperature detection sensor 12 that detects the temperature of the lower portion of the compressor is provided on the lower side surface portion of the compressor 1. It has been.

  The refrigerant in the gaseous state at high pressure and normal temperature discharged from the compressor 1 is sent to the outdoor heat exchanger 3 through the four-way valve 2 that switches between the cooling cycle and the heating cycle. The refrigerant in the gaseous state at high pressure and normal temperature that has entered the outdoor heat exchanger 3 is radiated to the outside by an outdoor blower (not shown) to be in a liquid state at high pressure and normal temperature.

The liquid refrigerant discharged from the outdoor heat exchanger 3 enters the electronic expansion valve 4, where the refrigerant is adiabatically expanded to be in a mixed state of a low-pressure and low-temperature liquid and gas. The refrigerant discharged from the electronic expansion valve 4 is sent to the indoor heat exchanger 5.

  While the liquid portion of the refrigerant in a mixed state of the liquid and gas sent to the indoor heat exchanger 5 moves from the inlet to the outlet of the indoor heat exchanger 5, an indoor blower (not shown) Heat is taken as latent heat from the object to be cooled, such as room air, and the object to be cooled is in a gaseous state while being cooled. The refrigerant discharged from the indoor heat exchanger 5 is returned to the compressor 1 through the four-way valve 2.

  The indoor heat exchanger 5 is provided with a saturation temperature detection sensor 13 for detecting the saturation temperature of the refrigerant. An intake temperature detection sensor 14 for detecting the intake temperature of the refrigerant sucked into the compressor 1 is provided in the pipe line from the four-way valve 2 to the compressor 1. The saturation temperature detection sensor 13 and the suction temperature detection sensor 14 are for calculating the heating degree of the indoor heat exchanger 5 from these detection temperatures.

  FIG. 3 is a block diagram showing the relationship between the control means and the temperature sensor in the embodiment of the present invention. As shown in FIG. 3, the output signals of the discharge temperature detection sensor 11, the compressor lower part temperature detection sensor 12, the saturation temperature detection sensor 13, and the suction temperature detection sensor 14 are sent to an I / O terminal of a microcomputer 15 as control means. Sent. The control terminal of the electronic expansion valve 4 is connected to the I / O terminal of the microcomputer 15. Reference numeral 16 denotes a power source that supplies current to the compressor 1 and the microcomputer 15.

  FIG. 4 is a graph showing the relationship between the flow rate change by the electronic expansion valve, the discharge temperature, and the temperature at the lower portion of the compressor. As shown in FIG. 4, when the flow rate is increased by the electronic expansion valve, the discharge temperature and the temperature at the lower portion of the compressor decrease, the temperature difference becomes smaller, and when the flow rate is decreased by the electronic expansion valve, the discharge temperature The temperature in the lower part of the compressor rises and the temperature difference increases.

  FIG. 5 is a graph showing the relationship between the difference between the discharge temperature and the compressor lower portion temperature (discharge temperature−compressor container bottom temperature) and the dilution of the lubricant inside the compressor. As shown in FIG. 5, when the difference between the discharge temperature and the temperature at the lower part of the compressor is large, the dilution is low, and when the difference between the discharge temperature and the temperature at the lower part of the compressor is small, the dilution is high.

  That is, the discharge temperature and the temperature at the lower part of the compressor are changed by the flow rate change by the electronic expansion valve, and the dilution degree can be obtained from the difference between the discharge temperature and the temperature at the lower part of the compressor.

  Next, the operation of the present embodiment having such a configuration will be described. Measurement results by the discharge temperature detection sensor 11 and the compressor lower part temperature detection sensor 12 are sent to the microcomputer 15. The dilution is calculated from the measurement result by the microcomputer 15 and stored in the memory. The memory of the microcomputer 15 stores a heating degree setting value that is a value for setting the heating degree of the indoor heat exchanger 5.

  Further, the measurement results by the saturation temperature detection sensor 13 and the suction temperature detection sensor 14 are sent to the microcomputer 15. From this measurement result, the actual heating degree of the indoor heat exchanger 5 is calculated by the microcomputer 15 and stored in the memory.

  Next, it is determined whether or not the value of the dilution is in a predetermined value range. When the value of the dilution level is within a predetermined value range, a normal heating degree setting value is stored as the heating degree setting value. Next, it is determined whether the heating degree obtained from the measurement results by the saturation temperature detection sensor 13 and the suction temperature detection sensor 14 is too high or too low as compared with the normal heating degree set value stored in the memory. When it is determined that the actual heating degree of the indoor heat exchanger 5 is too high, the opening degree of the electronic expansion valve 4 is controlled to be large. When it is determined that the actual heating degree of the indoor heat exchanger 5 is too low, the opening degree of the electronic expansion valve 4 is controlled to be small. A control signal for adjusting the opening degree of the electronic expansion valve 4 is sent from the microcomputer 15 to a control terminal (not shown) of the electronic expansion valve 4.

  On the other hand, if it is determined that the dilution value exceeds the predetermined range, the normal heating degree setting value stored in the memory is replaced with a heating degree setting value that is higher than normal. Is done. Then, it is determined whether the degree of heating obtained from the measurement results by the saturation temperature detection sensor 13 and the suction temperature detection sensor 14 is too high or too low compared to the heating degree set value set to this high value. Next, the opening degree of the electronic expansion valve 4 is adjusted in the same manner as in the case where the value of the dilution is within a predetermined value range.

  Here, the reason why the heating degree setting value is replaced with a heating degree setting value higher than the normal value when the value of the degree of dilution exceeds the predetermined value range is as follows. That is, a refrigerant in a liquid state among refrigerants in a mixed state discharged from the indoor heat exchanger 5 by operating the indoor heat exchanger 5 at a substantially higher heating degree by increasing the heating degree set value. The ratio of can be reduced. By reducing the ratio of the refrigerant in the liquid state in this way, the dilution can be reduced.

  If the air conditioner is configured as described above, the dilution degree can be obtained by using a versatile temperature detection sensor, and the opening degree of the electronic expansion valve can be adjusted by the control means. The operation of the air conditioner in can be suppressed.

(Embodiment 2)
FIG. 6 is a cross-sectional view of a vertical hermetic compressor according to Embodiment 2 of the present invention. In FIG. 6, a vertical hermetic compressor characterized in that a plurality of holes 25 are provided in the lower side surface of the hermetic container 21 and the holes 25 are connected by brazing with pipe-like copper tubes 26. By bypassing the hole 25 with a single copper pipe 26, the copper pipe 26 circulates through the stirred lubricating oil 24, whereby the accurate temperature of the lubricating oil 24 can be measured.

(Embodiment 3)
FIG. 7 is a cross-sectional view of the lower part of the vertical hermetic compressor according to the third embodiment of the present invention. In FIG. 7, a hole 25 or a plurality of holes 25 are provided on the lower side surface of the sealed container 21, and a burring portion 28 is provided outside the sealed container 21, and the copper tube 26 is inserted into the hole 25 and brazed. In addition to suppressing the inclination of the copper pipes 26, it is possible to improve the mounting properties, and it is possible to increase the rigidity by increasing the mounting strength of the copper pipes 26, thereby increasing noise and vibration generated from the copper pipes 26. Can be suppressed.

  As described above, the vertically installed hermetic compressor and the air conditioner according to the present invention include not only the air conditioner but also the dehumidifier as long as the vertically installed hermetic compressor is mounted and constitutes a refrigeration cycle. It can also be applied to machines.

Sectional drawing of the vertical installation sealed compressor in Embodiment 1 of this invention Block diagram in an embodiment of the present invention The block diagram which shows the relationship between the control means and temperature sensor in embodiment of this invention Graph showing the relationship between flow rate change by electronic expansion valve, discharge temperature and compressor lower part temperature A graph showing the relationship between the difference between the discharge temperature and the lower temperature of the compressor and the dilution of the lubricant inside the compressor Sectional drawing of the vertical installation sealed compressor in Embodiment 2 of this invention Sectional drawing of the vertical part hermetic compressor lower part in Embodiment 3 of this invention Block diagram of a conventional air conditioner

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Compressor 2 Four-way valve 3 Outdoor heat exchanger 4 Electronic expansion valve 5 Indoor heat exchanger 11 Discharge temperature detection sensor 12 Compressor lower part temperature detection sensor 13 Saturation temperature detection sensor 14 Suction temperature detection sensor 15 Microcomputer 16 Power supply DESCRIPTION OF SYMBOLS 21 Sealed container 22 Electric motor 23 Compression mechanism 24 Lubricating oil 25 Hole 26 Copper pipe 27 Raw material 28 Burring part 30 Dilution sensor

Claims (4)

In the high-pressure vertical compressor in which a motor and a compression mechanism and lubricating oil are stored below the inside of the sealed container and a gas compressed by the compression mechanism is discharged into the sealed container, the sealed container A vertical hermetic compressor provided with a pipe-like copper tube that is inserted from a hole provided on the lower side surface thereof and brazed to a hermetic container, and the other is brazed and connected by brazing. 2. The vertically placed sealed type compressor according to claim 1, wherein a plurality of holes are provided on a lower side surface of the sealed container, and the holes are connected by brazing with a pipe-shaped copper tube. Compressor. 3. The vertical hermetic compressor according to claim 1 or 2, wherein a hole or a plurality of holes are provided on the outer side of the hermetic container and a burring is provided on the outer side of the hermetic container. Compressor. An air conditioner comprising the vertical hermetic compressor according to any one of claims 1 to 3 and constituting a refrigeration cycle.

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